/* Knowledge Base View — V2.0（token 随 data-theme：侘寂 / 素白） */

.knowledge-base-view,
.kb-modal-overlay,
#kb-modal-host {
  --bg-main: var(--paper);
  --bg-card: var(--frost-72);
  --bg-hover: rgba(143, 142, 137, 0.12);
  --text-primary: var(--ink);
  --text-secondary: var(--ink-soft);
  --text-muted: var(--ink-faint);
  --text-inverse: var(--paper-hot);
  --border-color: var(--line);
  --border-active: var(--line-strong);
  --accent-color: var(--cement);
  --accent-hover: var(--cement-deep);
  --accent-light: rgba(143, 142, 137, 0.14);
  --danger: var(--danger-soft);
  --danger-color: var(--danger-soft);
  --font-sans: var(--font-body);
  /* 显式像素：勿写成 var(--radius-sm) 自引用，否则循环失效变直角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(46, 46, 43, 0.06);
  --shadow-md: var(--shadow-soft);
  --shadow-lg: var(--shadow-soft);
  --transition-fast: 0.15s ease;
}

#kb-modal-host {
  position: contents;
}

/* —— Shell —— */
.knowledge-base-view {
  position: absolute;
  inset: 0;
  z-index: 4;
  display: flex;
  flex-direction: column;
  background: linear-gradient(165deg, var(--paper-hot) 0%, var(--paper) 55%, var(--cement-fog) 100%);
  color: var(--text-primary);
  padding: 18px 24px 16px;
  overflow: hidden;
  font-family: var(--font-sans);
}

[data-theme="su"] .knowledge-base-view,
[data-theme="night"] .knowledge-base-view {
  background: var(--paper-hot);
}

[data-theme="night"] .knowledge-base-view,
[data-theme="night"] .kb-modal-overlay,
[data-theme="night"] #kb-modal-host {
  --bg-card: var(--frost-45);
  --bg-hover: rgba(255, 255, 255, 0.08);
  --text-inverse: #121218;
  --text-muted: var(--ink-soft);
  --accent-light: rgba(196, 194, 186, 0.16);
}

.knowledge-base-view[hidden] {
  display: none !important;
}

.kb-view-header {
  flex-shrink: 0;
  margin-bottom: 12px;
}

.kb-view-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  min-width: 0;
  width: 100%;
}

.kb-toolbar-right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  min-width: 0;
  max-width: 100%;
  flex: 1 1 auto;
  flex-wrap: wrap;
}

.kb-scope-tabs {
  display: flex;
  gap: 3px;
  padding: 3px;
  background: var(--frost-45);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  width: fit-content;
  max-width: 100%;
  flex-wrap: wrap;
}

.kb-scope-tab {
  padding: 6px 11px;
  border: none;
  border-radius: 6px;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.kb-scope-tab:hover {
  color: var(--text-primary);
  background: var(--frost-55);
}

.kb-scope-tab.active {
  background: var(--cement);
  color: var(--paper-hot);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.kb-search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  width: min(220px, 100%);
  min-width: 0;
  flex: 1 1 140px;
  max-width: 220px;
}

.kb-search-wrapper .search-icon {
  position: absolute;
  left: 10px;
  width: 14px;
  height: 14px;
  color: var(--text-muted);
  pointer-events: none;
}

.kb-search-wrapper input {
  width: 100%;
  padding: 8px 10px 8px 32px;
  border: 1px solid var(--border-active);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 12px;
  background: var(--frost-55);
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.kb-search-wrapper input:focus {
  border-color: var(--accent-color);
  background: var(--frost-70);
}

.kb-create-btn-header {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--frost-55);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 12px;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.kb-create-btn-header svg {
  width: 14px;
  height: 14px;
}

.kb-create-btn-header:hover {
  border-color: var(--accent-color);
  background: var(--frost-70);
}

.kb-close-btn {
  flex-shrink: 0;
  white-space: nowrap;
  padding: 6px 10px;
  border-radius: var(--radius-md);
}

.kb-header-create-mode .kb-search-wrapper {
  visibility: hidden;
  pointer-events: none;
}

/* —— Breadcrumb —— */
.kb-breadcrumb {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

.kb-breadcrumb[hidden] {
  display: none !important;
}

.kb-breadcrumb-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  flex: 1;
}

.kb-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 10px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--frost-45);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 12px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.kb-back-btn svg {
  width: 14px;
  height: 14px;
}

.kb-back-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-active);
  background: var(--frost-70);
}

.kb-breadcrumb-text {
  font-size: 13px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.kb-breadcrumb-text strong {
  color: var(--text-primary);
  font-weight: 600;
}

.kb-library-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.kb-library-actions[hidden] {
  display: none !important;
}

.kb-lib-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--frost-55);
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.kb-lib-action-btn svg {
  width: 14px;
  height: 14px;
}

.kb-lib-action-btn:hover {
  border-color: var(--accent-color);
  color: var(--text-primary);
  background: var(--frost-70);
}

.kb-lib-action-btn.danger:hover {
  border-color: rgba(138, 106, 90, 0.5);
  color: var(--danger);
  background: rgba(138, 106, 90, 0.08);
}

/* —— Grid & states —— */
.kb-grid {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  scrollbar-gutter: stable;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  padding: 4px 2px 12px;
  align-content: start;
  scrollbar-width: thin;
  scrollbar-color: rgba(110, 109, 104, 0.35) transparent;
}

.kb-grid.kb-file-list-mode,
.kb-grid.kb-create-mode {
  display: block;
  padding: 0;
}

.kb-grid.kb-create-mode {
  max-width: 920px;
}

.kb-loading {
  width: 100%;
  text-align: center;
  padding: 48px;
  color: var(--text-muted);
  font-size: 14px;
}

.kb-empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
  font-size: 13px;
  background: var(--frost-45);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-lg);
}

/* —— Library cards —— */
.kb-block-card {
  display: flex;
  flex-direction: column;
  background: var(--frost-55);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  min-height: 188px;
}

.kb-block-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-active);
}

.kb-library-card {
  position: relative;
}

.kb-card-cover {
  height: 88px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  padding: 10px 12px;
  position: relative;
  flex-shrink: 0;
  background: linear-gradient(145deg, var(--cement-mist), var(--cement-light));
}

.kb-card-cover.kb-cover-regulation {
  background: linear-gradient(145deg, #d4d2cb, #b8b7b1);
}

.kb-card-cover.kb-cover-process {
  background: linear-gradient(145deg, #cfc9be, #a8a196);
}

.kb-card-cover.kb-cover-training {
  background: linear-gradient(145deg, #ddd8d0, #b5b0a6);
}

.kb-card-type {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: rgba(240, 239, 233, 0.75);
  color: rgba(46, 46, 43, 0.65);
  backdrop-filter: blur(4px);
}

.kb-card-emoji {
  font-size: 28px;
  line-height: 1;
  filter: drop-shadow(0 1px 2px rgba(46, 46, 43, 0.08));
}

.kb-card-body {
  padding: 12px 14px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.kb-library-card .kb-card-body {
  gap: 8px;
}

.kb-card-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.kb-card-desc {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.kb-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: auto;
  font-size: 11px;
}

.kb-card-tag {
  padding: 2px 6px;
  border-radius: var(--radius-full);
  background: var(--accent-light);
  color: var(--text-secondary);
  white-space: nowrap;
}

.kb-card-date {
  color: var(--text-muted);
  white-space: nowrap;
}

/* —— Card menu —— */
.kb-card-menu-trigger {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: color var(--transition-fast), opacity var(--transition-fast);
  z-index: 2;
}

.kb-card-menu-trigger:hover {
  background: transparent;
  color: var(--text-primary);
}

.kb-card-menu-dropdown {
  position: absolute;
  top: 40px;
  right: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 140px;
  padding: 4px;
  z-index: 10;
  animation: kb-fade-in 0.15s ease;
}

@keyframes kb-fade-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.kb-card-menu-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 8px 12px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-primary);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.kb-card-menu-item:hover {
  background: var(--bg-hover);
}

.kb-card-menu-item-danger {
  color: var(--danger);
}

.kb-card-menu-item-danger:hover {
  background: rgba(138, 106, 90, 0.1);
}

.kb-card-menu-item:last-child {
  color: var(--accent-color);
}

/* —— File list —— */
.kb-file-list-panel {
  background: var(--frost-45);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.kb-file-list-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.25);
}

.kb-file-list-count {
  font-size: 12px;
  color: var(--text-muted);
}

.kb-file-upload-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border: 1px solid var(--accent-color);
  border-radius: var(--radius-sm);
  background: var(--accent-color);
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-inverse);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.kb-file-upload-btn svg {
  width: 14px;
  height: 14px;
}

.kb-file-upload-btn:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  opacity: 0.92;
}

.kb-doc-group {
  border-bottom: 1px solid var(--border-color);
}

.kb-doc-group:last-child {
  border-bottom: none;
}

.kb-doc-group-header {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 10px 14px;
  border: none;
  background: transparent;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-sans);
  transition: background var(--transition-fast);
}

.kb-doc-group-header:hover {
  background: var(--bg-hover);
}

.kb-group-chevron {
  width: 14px;
  height: 14px;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.kb-doc-group.open .kb-group-chevron {
  transform: rotate(180deg);
}

.kb-doc-group-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  flex: 1;
}

.kb-doc-group-count {
  font-size: 11px;
  color: var(--text-muted);
  background: var(--bg-hover);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.kb-doc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: none;
}

.kb-doc-group.open .kb-doc-list {
  display: block;
}

.kb-doc-flat-list {
  display: block;
  list-style: none;
  margin: 0;
  padding: 0;
}

.kb-doc-flat-list .kb-doc-list-item {
  padding-left: 14px;
}

.kb-doc-flat-list .kb-doc-list-item:first-child {
  border-top: none;
}

.kb-doc-list-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  cursor: pointer;
  border-top: 1px solid rgba(46, 46, 43, 0.04);
  transition: background var(--transition-fast);
}

.kb-doc-list-item:hover {
  background: var(--bg-hover);
}

.kb-doc-list-item.active {
  background: var(--accent-light);
}

.kb-doc-list-item.active .kb-doc-list-name {
  color: var(--accent-hover);
  font-weight: 600;
}

.kb-doc-list-ext {
  flex-shrink: 0;
  min-width: 36px;
  text-align: center;
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
  background: var(--bg-main);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.kb-doc-list-name {
  flex: 1;
  min-width: 0;
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.kb-doc-list-meta {
  flex-shrink: 0;
  font-size: 11px;
  color: var(--text-muted);
}

.kb-doc-list-delete {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-shrink: 0;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.kb-doc-list-delete svg {
  width: 16px;
  height: 16px;
}

.kb-doc-list-delete:hover {
  color: var(--danger);
  background: rgba(138, 106, 90, 0.1);
}

.kb-doc-visibility {
  flex-shrink: 0;
  font-size: 10px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--accent-light);
  color: var(--accent-hover);
  white-space: nowrap;
}

.kb-doc-visibility[data-level="P1"],
.kb-doc-visibility[data-level="P2"] {
  background: rgba(138, 106, 90, 0.12);
  color: var(--danger-soft);
}

.kb-doc-visibility[data-level="CUSTOM"] {
  background: rgba(143, 142, 137, 0.16);
  color: var(--cement-deep);
}

/* —— Pagination —— */
.kb-pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 16px 0;
}

.kb-page-btn {
  padding: 6px 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--frost-45);
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.kb-page-btn:hover:not(:disabled) {
  border-color: var(--accent-color);
  color: var(--accent-hover);
}

.kb-page-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.kb-page-info {
  font-size: 12px;
  color: var(--text-secondary);
}

/* —— Create panel —— */
.kb-create-panel {
  background: var(--frost-55);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.kb-create-header {
  padding: 20px 24px 0;
}

.kb-create-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 8px;
}

.kb-create-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}

.kb-create-desc strong {
  color: var(--text-secondary);
  font-weight: 600;
}

.kb-create-body {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 20px 24px 24px;
}

.kb-create-preview {
  min-width: 0;
}

.kb-create-preview-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 10px;
}

.kb-create-preview-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.kb-create-preview-ai {
  font-size: 11px;
  color: var(--accent-hover);
  font-weight: 600;
}

.kb-create-preview-card {
  cursor: default;
  min-height: 0;
}

.kb-create-preview-card:hover {
  transform: none;
  box-shadow: none;
  border-color: var(--border-color);
}

.kb-create-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.kb-form-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.kb-form-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
}

.kb-form-required {
  color: var(--danger);
}

.kb-form-optional {
  font-weight: 400;
  color: var(--text-muted);
}

.kb-form-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.45;
}

.kb-form-input,
.kb-form-textarea,
.kb-form-select {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--border-active);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--frost-55);
  outline: none;
  transition: border-color var(--transition-fast);
  resize: vertical;
}

.kb-form-select {
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  color-scheme: light dark;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%238f8e89' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 11px center;
  padding-right: 28px;
  resize: none;
}

[data-theme="night"] .kb-form-select {
  color-scheme: dark;
}

.kb-form-textarea {
  min-height: 72px;
}

.kb-form-input:focus,
.kb-form-textarea:focus,
.kb-form-select:focus {
  border-color: var(--accent-color);
}

.kb-create-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding-top: 4px;
}

.kb-create-btn {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.kb-create-btn.secondary {
  background: var(--frost-45);
  border-color: var(--border-color);
  color: var(--text-secondary);
}

.kb-create-btn.secondary:hover {
  border-color: var(--border-active);
  color: var(--text-primary);
  background: var(--frost-70);
}

.kb-create-btn.primary {
  background: var(--accent-color);
  border-color: var(--cement-deep);
  color: var(--text-inverse);
}

.kb-create-btn.primary:hover {
  background: var(--accent-hover);
}

.kb-create-btn.danger {
  background: transparent;
  border-color: rgba(138, 106, 90, 0.45);
  color: var(--danger);
}

.kb-create-btn.danger:hover {
  background: rgba(138, 106, 90, 0.1);
}

@media (max-width: 768px) {
  .kb-create-body {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .kb-create-preview {
    max-width: 220px;
  }
}

/* —— Team tree —— */
.kb-team-tree {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--frost-45);
}

.kb-team-tree-scroll {
  max-height: 280px;
  overflow-y: auto;
}

.kb-team-tree-loading,
.kb-team-tree-empty {
  padding: 24px;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

.kb-team-tree-selected-count {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  font-size: 12px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.25);
  min-width: 0;
}

.kb-team-tree-selected-label {
  flex-shrink: 0;
  white-space: nowrap;
}

.kb-team-tree-selected-names {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.kb-team-tree-list {
  padding: 4px;
}

.kb-tree-node {
  /* wrapper for nested nodes */
}

.kb-tree-node-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.kb-tree-node-row:hover {
  background: var(--bg-hover);
}

.kb-tree-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: var(--text-muted);
  border-radius: 4px;
  /* SVG 为向下箭头：折叠朝右，展开朝下 */
  transform: rotate(-90deg);
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.kb-tree-arrow:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.kb-tree-arrow.expanded {
  transform: rotate(0deg);
}

.kb-tree-arrow svg {
  width: 12px;
  height: 12px;
}

.kb-tree-arrow-placeholder {
  visibility: hidden;
}

.kb-tree-checkbox {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--border-active);
  border-radius: 3px;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.kb-tree-checkbox.checked {
  background: var(--accent-color);
  border-color: var(--accent-color);
  color: var(--text-inverse);
}

.kb-tree-checkbox.partial {
  background: var(--accent-color);
  border-color: var(--accent-color);
}

.kb-tree-checkbox svg {
  width: 12px;
  height: 12px;
}

.kb-tree-checkbox-dash {
  display: block;
  width: 8px;
  height: 2px;
  background: var(--paper-hot);
  border-radius: 1px;
}

.kb-tree-node-label {
  font-size: 13px;
  color: var(--text-primary);
  line-height: 1.4;
  word-break: break-all;
}

/* —— Multi-select —— */
.kb-multi-select {
  position: relative;
  width: 100%;
}

.kb-multi-select-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--border-active);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--frost-55);
  cursor: pointer;
  transition: border-color var(--transition-fast);
  min-height: 40px;
  box-sizing: border-box;
}

.kb-multi-select-trigger:hover {
  border-color: var(--accent-color);
}

.kb-multi-select-placeholder {
  color: var(--text-muted);
}

.kb-multi-select-value {
  color: var(--text-primary);
}

.kb-multi-select-arrow {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.kb-multi-select-arrow.open {
  transform: rotate(180deg);
}

.kb-multi-select-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 100;
  max-height: 280px;
  overflow-y: auto;
  background: var(--paper-hot);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  margin-top: 4px;
}

.kb-multi-select-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  font-size: 13px;
  font-family: var(--font-sans);
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
  transition: background var(--transition-fast);
}

.kb-multi-select-option:hover {
  background: var(--bg-hover);
}

.kb-multi-select-option input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  margin: 0;
  border: 1px solid var(--border-active);
  border-radius: 4px;
  background: var(--frost-55);
  cursor: pointer;
  flex-shrink: 0;
  position: relative;
  box-sizing: border-box;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.kb-multi-select-option input[type="checkbox"]:hover {
  border-color: var(--accent-color);
}

.kb-multi-select-option input[type="checkbox"]:checked {
  background: var(--accent-color);
  border-color: var(--accent-color);
}

.kb-multi-select-option input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 4px;
  height: 8px;
  border: solid var(--paper-hot);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.kb-multi-select-option span {
  display: inline-flex;
  align-items: center;
}

/* —— Modals —— */
.kb-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(46, 46, 43, 0.32);
  backdrop-filter: blur(3px);
}

.kb-modal {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  width: 420px;
  max-width: 90vw;
  box-shadow: var(--shadow-lg);
  font-family: var(--font-sans);
}

.kb-modal-upload {
  width: 480px;
  max-height: min(640px, 86vh);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.kb-modal-edit-team {
  width: 520px;
}

.kb-modal-upload-company {
  width: 560px;
}

.kb-modal-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 8px;
}

.kb-modal-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0 0 20px;
  line-height: 1.45;
}

.kb-modal-field {
  margin-bottom: 16px;
}

.kb-modal-field label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.kb-modal-input,
.kb-modal-textarea {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border-active);
  border-radius: var(--radius-sm);
  background: var(--frost-55);
  color: var(--text-primary);
  font-size: 13px;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color var(--transition-fast);
  box-sizing: border-box;
}

.kb-modal-input:focus,
.kb-modal-textarea:focus {
  border-color: var(--accent-color);
}

.kb-modal-textarea {
  resize: vertical;
  min-height: 72px;
}

.kb-modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 20px;
}

.kb-modal-btn {
  padding: 7px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font-sans);
  cursor: pointer;
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.kb-modal-btn.cancel {
  background: var(--frost-55);
  color: var(--text-secondary);
}

.kb-modal-btn.cancel:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.kb-modal-btn.confirm {
  background: var(--accent-color);
  color: var(--text-inverse);
  border-color: var(--accent-color);
}

.kb-modal-btn.confirm:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.kb-modal-btn.confirm:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.kb-modal-btn.danger {
  background: var(--danger-soft);
  color: var(--paper-hot);
  border-color: var(--danger-soft);
}

.kb-modal-btn.danger:hover {
  filter: brightness(0.95);
}

.kb-modal-btn.danger:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* —— Upload zone (modal) —— */
.kb-upload-zone {
  border: 1px dashed var(--border-active);
  border-radius: var(--radius-md);
  padding: 24px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  background: rgba(255, 255, 255, 0.35);
}

.kb-upload-zone:hover {
  border-color: var(--accent-color);
  background: var(--accent-light);
}

.kb-upload-zone svg {
  width: 28px;
  height: 28px;
  color: var(--text-muted);
}

.kb-upload-zone span {
  font-size: 13px;
  color: var(--text-secondary);
}

.kb-upload-hint {
  font-size: 11px !important;
  color: var(--text-muted) !important;
}

.kb-upload-file-list {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  max-height: 160px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.kb-upload-file-list[hidden] {
  display: none !important;
}

.kb-upload-file-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-top: 1px solid var(--border-color);
  font-size: 12px;
}

.kb-upload-file-item:first-child {
  border-top: none;
}

.kb-upload-file-name {
  flex: 1;
  min-width: 0;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.kb-upload-file-size {
  color: var(--text-muted);
  flex-shrink: 0;
}

.kb-upload-file-remove {
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: none;
  padding: 2px;
  cursor: pointer;
  color: var(--text-muted);
  flex-shrink: 0;
  font-size: 11px;
  font-family: var(--font-sans);
}

.kb-upload-file-remove svg {
  width: 14px;
  height: 14px;
}

.kb-upload-file-remove:hover {
  color: var(--danger);
}

.kb-visibility-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.kb-visibility-option {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--frost-45);
  text-align: left;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: all var(--transition-fast);
}

.kb-visibility-option:hover {
  border-color: var(--border-active);
}

.kb-visibility-option.active {
  border-color: var(--accent-color);
  background: var(--accent-light);
}

.kb-visibility-code {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-primary);
}

.kb-visibility-name {
  font-size: 12px;
  color: var(--text-muted);
}

.kb-upload-error,
.kb-form-error {
  margin: 0;
  font-size: 12px;
  color: var(--danger);
}

.kb-upload-error[hidden],
.kb-form-error[hidden] {
  display: none !important;
}

@media (max-width: 560px) {
  .kb-visibility-options {
    grid-template-columns: 1fr;
  }
}

/* —— Penetrate roles (edit modal) —— */
.kb-penetrate-section .kb-form-hint {
  margin-bottom: 10px;
}

.kb-penetrate-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.kb-penetrate-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--frost-40);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.kb-penetrate-item:hover {
  border-color: var(--border-active);
}

.kb-penetrate-item.is-checked {
  border-color: var(--accent-color);
  background: var(--accent-light);
}

.kb-penetrate-item input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent-color);
  flex-shrink: 0;
}

.kb-penetrate-item-body {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.kb-penetrate-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.kb-penetrate-dept {
  font-size: 11px;
  color: var(--text-muted);
}

/* —— Accessibility —— */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}